Pump mechanism.



1. A. SEYMOUR.V PUMP MECHANISM.

APPLICATION4 FILED OCT. I2. 1914.

2 SHEETS-sneer 1.

6 6 Patented Apr. 2, 1918. E

J. A. SEYMOUR. PUMP MEcHAmsM. APPLICATION' FILED OCTl I2. |914- Patented Apr. 2, 1918.

2 SHEETS-SHEET 2 JAMES A. SEYMOUR, 0F AUBURN, YORK.

rumr MEcHAmsM.

1b all whom-t may concern.

Be it known thatfI, ,JAMES Ae SEYMoUR, a citizen of the .United States, residing at Auburn, New York, have invented certain new and useful Improvements in Y Pump Mechanism, of which the following is la clear, full, and exact description.

This invention relates to an improvement in reciprocating pumps which is designed to avoid the disadvantages of a low and uncertain volumetric efiiciency which occurs in a small high speed pump when pumping very thick and heavy oils against a heavy pressure, or other fluids which interfere with the ,proper working of the suction valves of a pump of ordinary construction.

` The present improvement aims at obtain-V ing a consistent and uniform performance,

from a pump whether' the plunger of said pump be operated at long or short strokes,

and is especially adapted for use 1n supplyy ing oil fuel to hydrocarbon engines.

The various advantages of my invention will become more apparent from the follow#` ing description and the accompanying drawings which show the preferred embodiment thereof. e Y

Referring to the drawings, Figure l is an elevation of the compound pump partly in section; Fig. 2 is a similar view of a -modifcation; and Fig. 3 is a similar view ofa still further modification.

Referring more particularly to the drawings, S indicates a driving shaft for the pump which, in the case shown, is preferably the governor shaft of ticular construction of which is shown and described in my co-pending application Serial No. 864,222, filed February 13, 1914.

I have preferably shown the present pump construction in connection with a variable eccentric drivingdevice so as to vary the amolpnt of- Huid -pumped thereby at each stro e.

adapted for use with internal combustion engines employing liquid fuel in .which the rod R' operated from the eccentric 'E on shaft S. TheeccentricE is preferably movable to dierent positions on' its bearing to Specification f Letters -Patent.

an engine having a shaft governor A mounted thereon, the par- This arrangement is particularly but of course is adapted` vary its eccentr-icity relative to shaft S and thus vary the length of stroke of pump plunger P. It is to be understood that the position of the eccentric E iscontrolled by the Weights C of governor A.,vas described in my copending application above referred 1s preferably several times greater than the plunger P of the main pump, and this auxiliary pump is larranged to deliver fluid to the main pump. T-he auxiliary pump draws fiuid from inlet i through inlet valve'z'1 and delivers the fluid through outlet valve d, passageway I, to the inlet valve` I1 ofthe lmampump. A relief valve X1 is provided for the auxiliary pump to permit the escape of the surplus fluid discharged thereby, and a passagewayy X conducts this surplus back to the inlet z. The auxiliary pump plunger` p is connected to the shaft S so as to reciprocate in opposite phase with the plunger P of the main pump. This action causes the auxiliary pump to furnisha pressure head at the inlet for said main pump, in addition to the Ipressure caused by the normal suction of the plunger P during its intaking stroke, which supplemental pressure head is removed as soon as auxiliary plunger p fin- `ishes its expelling stroke Since the auxiliary pump always furnishes an excess to said mam pump under th1s increased pressure,

it will insure the complete filling of cham-- ber of plunger lP at each withdrawal of hsaid plunger.- The auxiliary pump is preferably worked at low pressures, and the Irelief Patented am. e, ieia. Application led October 12, 1914. Serial No. 866,183. i Y

-valve'X1 is so adJusted that it will open at -the desired pressure and permit the return of surplus discharge back to the supply z'. By thus roducing a su plemental pressure head on t e inlet valve El during the intakin stroke of the main plun er P when the va ve-.Ilshould be open, anc? su lplemental pressure-'head during' the expe ing stroke'when'the valvefIl, should be removing said closed, the'spring Y of said valve may be made of considerable stiffness so thatvsaid valve I1 will be operated with more certainty than if dependent only upon the working of plunger l?. This'arrangement will lessen the uncertainty of volumetric efficiency Iof the pump at comparatively short strokes cf the pump plunger. volumetric efliciency of the main pump P will be always the same for the same stroke whether said stroke be long or short, and this is of particular advantage in a pumping mechanism used for supplylng oil fuel to a 'h drocarbon engine 1n which'the supply of .fuel and the running of the engine is regulated by a variation in the stroke .of the pump plunger. v

It will be noted that plunger P beglns 1ts intaking stroke at the same moment that plunger p begins its discharging stroke. At this moment also both of the valves d and lX1 open and remain open during the entire discharging stroke of plunger p. A certain proportion of the discharged fluid is continually passing through valve X1 throughout this discharging stroke of plunger p, the amount at any instant depending upon the difference in rate of displacement between plungers p and P. l

It 'may be desirable in some instances to eliminate the valves in the auxiliary pump, in which case the same results can be accomplished by making the size of the passageways ,i and X leading to the inlet of the auxiliary pump, small in comparison tothe passageway I leading from the outlet of the auxiliary pump. The U restricted passageways i and X will then cause the fluid at each discharging stroke of pump p to prefer the freer passageway I leading to the inlet of the main pump and thus insure the filling of its chamber as before.

W is a stand pipe connected to the highest part of the pump passageways to permit the escape of air therefrom. It is understood that this' stand-pipe leads to the vatmosphere at some level above the source of supply. y

In the modification of the invention shown in Fig. 2, 3 indicates the main forcing plunger adapted tolworkv against high pressures, and `2 indicates vthe auxiliary pump plunger adapted to work against low pressures, and y,these plungers are preferably connected together by a frame 1. and driven by the eccentric`E so asto reciprocate together in opposite phase. As shown, the auxiliary pumpdraws fluid from the supply v1 through inlet valve 4, and feeds fluid through outlet valve 5, passageway 8, and

' the .inlet valve .9 of the main pump. 1,0

indicates the outlet valve for the main. 'pump, and 11 indicates the loutlet ofsaid main pump. 6 indicates the relief valve for the auxiliarypump; `and 7 the return passageway from said relief valve back to In other words, thev E, which in this case as in the case of the construction shown in Fig. 1, may have its eccentricity varied to vary the stroke of said plungers.

Fig. 3 shows an arrangement in which two duplex pumps are cross-connected to supply one another. Each duplex pump consists of a large plunger indicated. atV 12 and 121 and small plungerfindicated at 13, 131, working inilarge chambers indicated at 14, 141 and small chambers indicated at- 15, 151. The small 'chambers 15, 151 are formed by tubular sleeves 23, 231 extending for some distance within the large chambers 14, 141 and surrounding the plungers 13, 131 so that an extensive sliding fit is provided between each sleeve and its plunger to prevent leakage therepast when no other packing is usedr The inlet from the source of supply is at i, and passageways 25 and 251lead therefrom to the inlet valves 16, 161 respectively. The large chamber of each duplex pumpgis cross-connected as shown, from the outlet valves 17 171 to the inlet valve 19, 191 of the other duplex pump through passageways 18 and 181. 21, 211 indicate the relief valves for auxiliary plungers of each in the other duplex pump. W2 and Ws indicate stand pipes for the escape ofl air. A

The valves 21, 211, 17, 171 and 16, 161 for the large plungers 12, 121 may be omitted in a similar manner as that described with respect to Fi'g. 1, namely, by making the passageways 22, 221 and 25, 251 small in comparison with passageways 18, 181. n The duplex pumps are connected together1 by means of yoke '1 so as to reciprocate in oppositephase and are driven in the usual way from the eccentric E through rod R. In the operation of this duplexr pump there is a saving of energy in that no surplus Huid is returned to the source of supply to be I, pumped out over again. The surplus overflow from the outlet of each large chamber is conducted to the inlet of the other large chamber and this-v necessitates only a proportionately small additional quantity to be drawn from` the source of supply.

Since the plungerof each large chamber will draw in ateach stroke more fluid than the surplus from theother large chamber,

no part of this surplus will therefore be returned to the source of supply.

lIt is understood that various chan-ges and modifications may be made in the details of the present construction Without departing from the spirit of the inventiong'as set forth in the following claims: What I claim as new is 1. In a fluid pump mechanism, in combination, a main pump comprising a main reciprocating plunger, a Variable eccentric driving device for operating said main plunger with strokes of dilerent length, an auxiliary pump for supplying fluid to said main pump comprising an auxiliary reciprocating plunger of suliciently greater displacement than said main plunger that said auxiliary pump tends to oversupply said main pump during the different strokes of said main plunger.

2. lna luidpump mechanism, in coin-l bination, a -main pump comprising a main reciprocating plunger, an axuiliary pump for supplying fluidfto-said main pump comprising an auxiliary reciprocating plunger of greater displacement than said main plunger and Working in opposite phase thereto whereby said auxiliary pump tends to oversupply said main pump.

3. ln a fluid pump mechanism, in combination, a main pump comprising amain reciprocating plunger, means for operating said plunger with strokes of different length tovvary the capacity of said main pump, an auxiliary pump for supplying said main pump comprising 'an auxiliary reciprocating plunger of sufficiently greater displacement than said main plunger that 'said 'bination, a pair of duplex pumps, each duauxiliary pump tends to oversupply said main pump duringthe diEerent strokes of said main plunger. v

4. In a fluid pump mechanism, in combination, a source of supply, a main pump comprising a main reciprocating plunger,

an auxiliary pump for supplying fluid to said main pumpxfrom said source of supply, comprising an auxiliary reciprocating plunger of greater displacement than said main plunger and Working in opposite phase thereto, whereby said auxiliary pump tends to oversupply said main pump, and a relief port. for said auxiliary pump communicating with said source of supply. i

5. ln av fluid pump mechanism, in combination, a source of supply, a. main pump comprising a main reciprocating plu'ger, an auxiliary pump for supplying fluir to -said main pump from said sourceof supply7 comprising an auxiliary reciprocating plunger or greater displacement than said main plunger and Working in opposite phase y thereto, whereby saidauxiliary pump tends to wei-supply said main pump, areliefport for said auxiliary pump communicating with said source of supply, and a valve for said reliet` port arranged to open during the entire, expelling stroke `of said auxiliary plunger.

6. A fluid pump mechanism comprising inl ,in' combination, 4a pumping chamber, a

plunger Working therein, means supple-l inenting the suction of said plunger during its intaking stroke which tend to supply fluid to said chamber at a greater rate than the rate of displacement of said plunger, said lmeansv acting to check the supply ol fluid to said chamber at a time not earlier than the completion of said suction stroke.

'8. ln a Huid pump mechanism, in combination, a main pump comprising a main pumping chamber and a plunger Working therein, an auxiliary pump comprisinga reciprocating plunger of greater displace. ment than said iirst named plunger and Working inopposite phase thereto for supplying at each expelling stroke of said auxiliary pump plunger an excess of fluid to saidl main pumping chamber,'and a reliet port for said auxiliary pump open during each entire expelling stroke of said auxiliary pump plunger to -take care of said excess supply. f t

9. In a fluid pump mechanism, in coniplex pump comprising large and small pumping chambers With inlet and outlet ports and large and small plungers working in said respective chambers, the outlet port. ofthe large chambervot each duplex pump having communication with the inlet port 'of the small chamber of the other duplex large and small plungei's working therein,v

the outlet opening of the large chambenot` eaeh duplex pump being` eonneelcd to the inlet of the small elianibei' oi the other duplex pump` and means for operating the plungers of each duplex pump in opposite phase to the plungersof t ie' other duplex pump. 11. ln agluid pump mechanism in combination, apair of duplex pumps each duplex pump comprising large and small pumping chambers with inlet and outlet openings and large and small lu'ngers Working therein, a source of supp yV having communication lllltll lll5 iai

with the inlets of said large chambers, the outlet opening of the large chamberof each duplex ump being connected to the inlet of the small chamber of the other duplex pump, an overiow relief valve for each large chamber and means for conducting the overflow from each large chamber to the inlet of the other large chamber, and means for operating the plungers of each duplex pump in opposite phase to the plungers of the other duplex pump.

12. In a fluid pump mechanism, in combi-l nation, a mam pump comprising a main reciprocating plunger, an auxiliary pump for supplying iuld through an inclosed communie-ating passage to said main pum comprsng an auxiliary reciprocating p unger` of greater displacement than' said main plunger, and Working in opposite phase thereto, whereby said auxiliary pump tends to oversupply the main pump, and a relief port for said communicating passage to vpermit the escape of saidA excess supply.

13. In a fluid pump mechanism, in combination, a main pump comprising a high pressure plunger, a source of fluid supply, an auxiliary pump for supplying fluid from said source through an inclosed communieating passage to said main pump, said auxn iliary pnimp having a low pressure plunger of greater displacement than said high ressure plunger, and Working in opposite p ase thereto, a relief port for said communicating passage to prevent excessive pressures therein which would otherwise occur by reason of the dierence in displacement between said high pressure and low pressure plun,

gers, said relief portv being open to said said auxiliary pump source of supply during. substantially the' entire expelling stroke off-said low pressure plunger so as to continuously return to said source of supply an amount of fluid representing the .difference in rate of displacef I ment between said high and low pressure plungers.

14. In a Huid pump mechanism, in combination, a source of iuid supply, a main pump comprising a high pressure recipro eating plunger, means for varying the stroke of said plunger during the operation of said pump, an auxiliary pump for supplyingv iuid from said source through an inclosed communicating passa e to said main pump, aving a low pressure plunger of greater displacement than said high pressure plunger and working in opposite phase thereto, a relief portv for said communicating passage to prevent excessive JAMES A. SEYMOUR.

Witnesses:

C. T. NEAL, BEATRICE Mmvrs. 

